Question

The weights (in kg) of 11 Stem B follow a normal distribution and has a mean of 52 and a standard deviation of 4. How many students have weights greater than 56?

Answer 1

$$P(X>56)=1-P(Z\le\frac{56-52}{4})$$ $$=1-P(Z\le1)=0.158655$$

$15.8655\%$

$$N=11(0.158655)\approx 2.$$